How To Fix A Lawn Mower With No Spark. You can check this by tightening the bolts or just replacing them if they are too loose. Combustion engines need three things to make them work.
The problem could be that the spark plug is loose, dirty or faulty in some way. If the plug doesn’t make good contact with the metal of the engine, you won’t get a spark. If you don’t have a spark tester, you could always grab a new plug, stick it in the ignition wire and hold the plug to a ground on the motor.
Another common problem that could be causing your riding lawn mower not to start is when the starter motor mounting bolts are loose. To check that the spark plug is in good order, work through the following steps. Fixing this problem depends on various factors.
I have tested for spark and found no spark at all. Because the size specifications are different, the two spark plug types can’t be interchanged. Uncharged battery or poor connection.
If you don’t have a spark tester, you could always grab a new plug, stick it in the ignition wire and hold the plug to a ground on the motor. I stripped the cowl off and had a look at the coil thinking that perhaps there was a problem with the lead or ground wire, or coil spacing. The problem could be that the spark plug is loose, dirty or faulty in some way.
If the plug doesn’t make good contact with the metal of the engine, you won’t get a spark. As said earlier, armature failure is more likely. Remove the spark plug lead from the plug terminal.
If no spark is present, suspect a faulty armature (coil). Most of the time, cleaning the blade, spark plug, or carburetor, replacing any of these parts, using proper petrol blend, and replacing old petrol are among the most common solutions. The mower stopped running yesterday during use and wouldn't restart.